calc a <major>.<minor> branch for unqualified template names
calc a <major>.<minor> branch for unqualified template names

doesn't calc a branch if a url/shortcut is supplied that hostedGitInfo knows
how to parse

only does this for unqualified names if a committish isn't supplied, i.e.
doesn't override '#develop' in 'typescript#develop'

iurimatias/embark-framework,iurimatias/embark-framework